Hi Jeff,
Thanks. That means, this is a known periodic delay in the RTOS execution.
I am executing time critical function in the ISR. I do not expect any delay during entry of the ISR.
I have tried to search the configuration in the project to see for configMAX_API_CALL_INTERRUPT_PRIORITY. Did not found any instance. Can you please provide more insight how this can be configured to unmask RTOS interrupts? I am not using any RTOS APIs in my ISR.